Proximity card, dual. It works on 125 kHz and 860 MHz frequencies. Designed for cooperation with Unique card readers (eg KDH-C100U) and long-range readers working in the UHF band (eg KDH-CDZ900). It is worth noting that the number printed on the card is the same for both versions (Unique and UHF) which makes it easier to add it to the system using the USB administrator card reader - KDH-CADM-U24.